<<< mml $${}_5{}^6{}_7{}^{8}X_1^2{}_3{}^4{}_{8}X_1^4{}_{8}X^{4}X_1{}_{3}F_2$$ >>> native [ EGrouped [ ESubsup (EGrouped []) (EGrouped [ ENumber "5" , ENumber "7" ]) (EGrouped [ ENumber "6" , ENumber "8" ]) , ESubsup (EIdentifier "X") (EGrouped [ ENumber "1" , ENumber "3" ]) (EGrouped [ ENumber "2" , ENumber "4" ]) ] , EGrouped [ ESub (EGrouped []) (ENumber "8") , ESubsup (EIdentifier "X") (ENumber "1") (ENumber "4") ] , EGrouped [ ESub (EGrouped []) (ENumber "8") , ESubsup (EIdentifier "X") (EGrouped []) (ENumber "4") ] , ESub (EIdentifier "X") (ENumber "1") , EGrouped [ ESubsup (EGrouped []) (ENumber "3") (EGrouped []) , ESubsup (EIdentifier "F") (ENumber "2") (EGrouped []) ] ]